Water heating and circulating device



R. GREN HAM WATER HEATING AND CIRCULATING DEV-ICE Filed May 26, 1920 2J zz Patented Nov, 6, i923,

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RICHARD GBEENHAM, OF SAN FRANCISCO, CALIFORNIA.

WATER HEATING ANI) CIRCULATING DEVICE.

Application led May 26, 1920.

T 0 all 107mm 'it may concern.'

Be it'known that I, RICHARD GREENHAM, a citizen oiE thev 1United States, residing at the city and county of San Francisco and AState of California, have invented a new and useful Improvement in lWater Heating and Circulatingv Devices, of which the following is a specification.

This invention relates to a water heating and circulating device, and especially to a thermo-Siphon actuated circulating; system whereby hot water may be delivered to points considerably below the level of a heater and maintained in constant circulation by thermo-Siphon action.

It is well known that most hot water heating and circulating systems employed today operate on the thermo-Siphon principle, that is water within a coil or like heating device will expand and travel in an upward direction when subjected to heat, thus starting a circulation of the water which continues as long as heat is applied. Hot water radiators and like devices are often operated on this principle and are eiiicient and satisfactory in operation as long as they are located at a point above the heater. They however become, practically speaking, inoperable when located on an approximate level with the heater as it is ditlicult to maintain thermosiphon circulation through the same at this point and they become altogether useless and inoperable if placed even a foot or so below the heater. rlhis is obviously a great drawback asy it renders it almost impossible to operate radiators on the same tloor as that on which the heater is located;` this being due to the fact that the radiators as a rule are placed directly on the floor and the heater above the same to make room for a fire boX, burners, etc.

One of the objects of the present invention is to provide a water heating and circulating device which operates on the thermo-Siphon principle, but is-capable of delivering hot water to points several feet below the heater, and simultaneously maintains the water thus delivered in constant circulation, thus rendering it possible to eiiiciently operate radiators whether placed on a level with the heater or when placed a considerable distance below the same.

Further objects will hereinafter appear.

The invention consists of the parts and the construction, combination and arrangelate.

Serial No. 384,273.

ment of parts as hereinafter more fully described and claimed, having reference to the accompanying drawing, in which the ligure is a diagrammatic view showing the piping system and the circulating device.

Referring` to the drawing in detail, A indicates a suitable form of heater, consisting of a stove or the like, in which is mounted burner and a coil 2. 3 indicates an ordinary hot water kitchen tank, l the service pipe, through which cold water is admitted rom a source of supply, 5 the outgoing hot water service pipe, 6 the hot water intake connection, and 7 the cold water outlet. This is connected by a pipe 8 with the lower part of the heating coil 2, while the upper end of the heating coil 2 is connected with a circulating device, generally indicated at B. This device consists of an exterior stand pipe 9 and an interior pipe 10, the inner pipe being of such a diameter that a surrounding annular passage 11 is formed, through which the hot water discharging from the coil F2, will circurl`he pipe 10 is connected with the hot water intake connection 6 and extends downwardly through the exterior pipe 9 and terminates near the bottom thereof. rllhe lower end of the pipe 1() is open and water is admitted thereto fromthe annular passage 11. The lower end of the pipe 9 is closed by a cap or a similar device 12, and the upper end by means of an elbow 13 and a plug .14. rlhe hot water inlet connection 5 passes through said plug and is connected with the pipe 10 by means of anelbow 15. p

The upper end of the heating coil is connected with the exterior pipe 9 by means of a T-connection 16, and a circulating pipe 17 is employed whichterminates above and below the 5`connectoin 16, as will hereinafter be described. y

In actual operation with a fire started under the coil 2, it can readily be seen that the water heated in the coil 2 will rise upwardly through the same and will disto rise upwardly and discharge into the tanlr 3, and a downward flow of liot water through the annular chamber 11 will then. commence as an upward flo-w of water in the pipe will naturally have to beY replaced by water from the. annular passage. The hot water entering the tank through the connection 6 collects in the upper portion thereofA in the usual manner and may be drawn oftthrough the pipe 5, any water drawnA through this pipe being automatically' replaced from the main cold water service pipe 4. I/,Vater is atthe samevtiine constantly entering the lower portionv of the heating coil 2 and circulation is therefore'inaintained so that all the water `will gradually increase in temperature.

'pipe 10.

The important feature ofL the present. in-V tion to a' point'approxiinately tenk feet below lthe heater proper, and as faras I know circulation might be carried downwardly a considerably greater distance.

, From the foregoing it can be seen that the hot water discharging from vthe coil 2 will flow downwardly through the. annular 'passage,`due to the thermoesiphon action in the pipe lO. VThe circulating device comprising'tliepipes 9 and lOis therefore at all "times filled with hot water and" if it is de- .psired tov supply av radiator, or to otherwise `{employ the hot water, it is'only necessary to tap the exterior pipe as shown at 19. The

tap VVconnection should be made above the lower end` of the pipe 10. Hot water thus withdrawn may be directed to Va radiator such as indicated at 20, and the return'connection therefrom' may be made directly with the lower end of the circulating device i f as by means of a pipe 21, circulation through the radiator being of course regulated by avalve 22, or other suitable means.

In the present drawing I have illustrated the heater A and main circulating tank 3 as located on one floor, 'and the radiator 20 on the door below thefsarne, this being done to illustrate the possibilities of the present invention.

l/Vhile the apparatus here illustrated is specifically employed for circulation of hot water, it is obvious that it may be employed for otherpurposes, for instance, for the circulation ofV other liquids and fluids, and I similarly wish it understood thatv various changes in design and construction may *beV Y resorted to within the scope ofthe appended claims, also that theV materials and finish of the several parts employed may be suchy as the experience and judgment of the manufacturer ymay dictate or if'arying conditions may demand.

Having thus described my invention, what- I claiin' and desirel to secure by Letters Patent isl. A water heating and circulating device` i comprising a heater, a stand pipe, a 'receptacle, a tube in the stand pipe connected yat one end with the receptacle andI having its lower end open and terminating in the lower end of thestand pipe, means for deliveringliot water from the heater to the upper portion of they stand pipe to heat the upper portion of the tube extending therethrough so as to start a thermosiphon flowl through said tube, and a return `eon'i'iection 4between the receptacle and the lower portion ofthe heater. Y

2. A liquid heating and circulating 'apparatus comprising a heater and a receptacle, an interposedy circulating device including a stand-pipe, an inlet pipe connecting the'.

a tube extending through the stand-pipe and connected at its upper end with the 'receptacle and open at its lower end to coin- 'municate with' the interior lower end of the stand-pipe, a'radi'ator, a pair -of pipes connecting the radiator withthelower end of the stand-pipe, one forming a feed Aand the other a return connection, and ,a pipe connection between the lower part of the receptacle and the heater. Y

`In testimony'whereof I have hereunto set my hand in tliepresence of two subscribing witnesses.

Witnesses SAMUEL AVERY, W. W. HEALEY.

upper end of the stand-pipe with the heater,

iiiciiARD GREENHAM. l 

